Buttonville Municipal Airport or Toronto/Buttonville Municipal Airport (IATA: YKZ, ICAO: CYKZ) was a medium-sized airport in the neighbourhood of Buttonville in Markham, Ontario, Canada, 29 km (18 mi) north of Downtown Toronto, which closed in November 2023. It was operated by Torontair. Due to its location within Toronto's suburbs, there were several strict noise-reduction procedures for aircraft using the airport, which was open and staffed 24 hours a day, 365 days a year. In 2014, Buttonville was Canada's 20th busiest airport by aircraft movements. There was also a weather station located at the airport, which was still operational on the site but closed along with the airport (weather data for Markham is now referencing to Toronto City Centre Airport by Environment Canada).

The airport was classified as an airport of entry by Nav Canada and was serviced by the Canada Border Services Agency (CBSA) on a call-out basis from Oshawa Executive Airport during weekdays and Billy Bishop Toronto City Airport on the Toronto Islands during weekends. CBSA officers at this airport handled general aviation aircraft only, with no more than 15 passengers.

In May 2023, the airport operators announced plans to close the airport to its tenants, and a NOTAM was issued stating CYKZ was officially closed at 11:00 (EST) on November 24, 2023.